Grinding-disk.



` J. G. BRYANT.

` GRINDING DISK.

APPLIOATION FILED DBO. 5, 1910.

1,009,021, Patented N0v.14,1911.

A Mv m ,W WA Attnrnrga pira sns rar FFIQ.

JAMES G. BRYANT, OF PORT HUB-ON, MICHIGAN, ASSIGNOR TO AMERICAN MACHINERY COMPANY, OF PORT HURON, MICHIGAN, A CORPORATION OF MICHIGAN.

GRINDING-DISK.

Specification of Letters Patent.

Patented Nov. i4, 191.1.

To all rrr/0m it 'may cm1 cern Be it known that I, Jannes Gr. BRYANT, a citizen of the United States, residing at Port Huron, county of St. Clair, State of Michigan, have invented a certain new and useful Improvement in Grinding-Disks, and declare the following to be a full, clear, and exact description of the saine, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to grinding disks for grinding grain.

It has for its object an improved metallic grinding disk, similar in its formation to the grit millstones, but which because of improvements which form a special object of this invention! is somewhat different in action therefrom and much more efficient.

In the drawings z--Figure l, is a perspective showing the manner of arranging the separate parts which form a complete grinding disk. Fig. 2, is a plan view of a segment of said grinding disk. Fig. 8, is a radial cross section along the line 3-*3 of Fig. 2. Fig. 4, is a cross section at right angles to the radius along the line 4-4 of Fig. 2.

Preferably, the disk is made double-faced in order that each portion thereof may be used, that is, with either side out. The double face characteristic is not, however, considered as a special feature of invention, the invention relating to the formation of certain grooves and baffles located in the grooves. The entire disk is divided into segmental parts, of which the part indicated as inclosed between the lines a, b, c, CZ, may be considered as one segment, this being a quarte-r of a circle disk, although the segment may be made in any proportion with reference to the entire circle. Each segment is divided into small segments by radial lines e, f and g, z. The radial lines e, l7E, and g, h, and radial lines a, Z), and c, CZ, are raised as ribs on the face of the plate and constitute radial ribs; preferably one side of the groove between the ribs is more steeply inclined than the second side of the same groove. The steep inclination l which approaches to an undercut condition or a nearly vertical condition as indicated in Fig. 4, is on the forward side of the disk. that is, it is on that side of the groove which .is to the front when the disk is in revolution, (the arrow in Fig. 4 indicating the direction of movement of the disk in grinding) and the more inclined and substantially parallel side 2 being behind or to the rear of the less inclined side l in respect to its direction of motion. Between the successive radial ribs c, CZ, and g, li, the surface of the segment is ribbed forming deep grooves that are parallel to the rib g, 7i, the rib g, l1., being the following rib with respect to the rib c, (Z, all the parallel grooves open into the radial groove which extends along the rear of the rib c, d, and extends radially from c to (l. The parallel grooves gradually decrease in length from the one next to the rib g, 7i to the shortgroove 7c, m, which is near the outer extremity of the radial groove c, CZ. All of the parallel arranged grooves between the parallel ribs are preferably constructed with the same difference of inclines on their forward and rear boundary walls, the forward boundary wall in each case being preferably more sharply inclined and approaching to an under-cut condition than the rear wall of the groove. Each of these grooves is interrupted at intervals between its inner and outer ends by baffles 7, which interrupt the groove, but do not rise entirely to the top thereof`r the baflle member being a small rounded projection rising from the bottom of the groove and extending toward the top, and in appearance resembling roughly the half of a ball or half of a shot dropped into the groove. These baffles are arranged in staggered relation in the successive grooves. For a short distance from the opening- 6 which engages over the feed member (not shown) the ends of those ribs which lie between the radial ribs are inclined or cut away to furnish a comparatively large opening for the introduction of grain into the space between the grinding disk and its companion grinding disk which faces it, and which companion grinding disk is not shown on the drawing. All of the ribs are trimmed to bring their upper boundaries into a plane and these trimmed edges of the ribs engage closely adjacent to the similar rimmed edges of the companion disk.

The grain introduced at 8 between the two disks catches against the rib c. Z and travels rapidly outward along the rib c. CZ until it is caught by the end of one of the parallel ribs. It thereafter travels along the groove between the parallel ribs encountering the baffles at intervals and at each encounter with the batiie the berry of grain is thrown upward into Contact with the companion disk, and is cut between the shearing edges of the ribs of the two disks. The action serves to cut the grain rapidly and finely, making a meal of it however, rather than a powder.

The disks are assembled in a packing frame ll to which they are bolted and by which they are held in proper relation and with a suiiieient security to hold the piane surface passing through the trimmed ofi' edges or' the ribs, in proper relation to the companion disk of the mill; in order that each segment may be held to the packing frame it is provided with holes l2 through which bolts 13 pass to secure the segment in place.

What I claim is 1. A. grinding disk, having on its face a plurality of shearing ribs forming grooves of uniform width, and a plurality of baiiies placed along each rib, the said battles .being of uniform height and extending clear across the groove and the battles of adjacent grooves arranged in staggered position whereby the grain is required to rise in order to pass the battles and is caught by the shearing edges of the ribs, substantially as described.

2. A grinding disk, having a rib rising Jfrom the face of the disk, said rib having substantially parallel sides and a flat top parallel with the plane of the disk, said rib being under-cut on one side forming an acute angle with the Hat top at suc-h side, the two angles at. the top forming shearing edges, whereby the rib may be ground down several times without changing the angle at the top and the reducing properties of suoli rib, substantially as described,

A grinding disk, having its face divided into grooves by a plurality of shearing ribs, battles in each groove, the baffles being arranged in staggered relation along successive grooves, and means for feeding said grooves with grain, substantially as described.

In testimony whereof, I sign this specication in the presence of two witnesses.

JAMES Gr. BRYANT.

Witnesses z L. N. MCFARLAND, RUSSELL T. JACKSON.

Copies oi' lthis patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, ID. C. 

